Publication 1747-UM011G-EN-P - June 2008
Special Grounding Considerationsfor dc Applications using 
1746-P3 (previous to revision B)
This information describes special wiring considerations for the 1746-P3 
power supply that is not labeled as revision (REV) B or later-.
Keep wire length as short as possible.
ATTENTION
Any voltage applied to the 1746-P3 DC NEUT terminal will be 
present at the SLC logic ground and the processor DH-485 port. 
To prevent unwanted potentials across the logic ground of the 
controller and/or damage to the SLC chassis, the DC NEUTRAL 
of the external dc power source must be either isolated from 
the SLC chassis ground, or connected to earth ground.
SLC Logic Ground
SLC 500 Chassis Processor
1746-P3
Door
A jumper wire is recommended 
between the DC NEUT and Chassis 
Ground of the external power source.
Earth Ground
Not Used DH-485 
Port
Earth Ground
External dc Power Source
+24 VDC
DC NEUT
Chassis 
Ground
Not Used
+24V dc
DC Neut
Chassis 
Ground
Safety GroundTotal PPS180-40 
Total 7000-M0
emecanique VR2SA2121
Sütron TP32ET-01/029049
Sütron BT20N BT20N/081030
Stromag ADC 006.3
SMAK Baugruppe SMAK GL 4904.3200
SK1 Baugruppe SK1 GL 4905.5400
Control Techniques 140X8/16
Control Techniques 140X14/28 28A
Control Techniques 140X14/28 DCD AS-IS
Control Techniques 140 X 14/28 140X14/28
Control Techniques 2400-8000 24008000
Control Techniques 2400-8001
Control Techniques 2450-4000
Control Techniques 2450-4012
Control techniques 566-860-000
Control Techniques 6150

1756-EN2T  1756-EN2T  

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